Method and apparatus for transmitting and receiving extension information of component carrier in wireless communication system

ABSTRACT

A base station includes: an area information generation unit which generates information for a determined second area by determining an additional assignment of the second area different from a first area to a component carrier (CC) of the first area having a bandwidth smaller than a bandwidth of a maximum assignable CC; a mapping control unit which controls an assignment of a reference signal to a frequency band including the first and second areas by generating the reference signal for channel estimation in the first and second areas; a signal generation unit which generates the information for the second area and the reference signal as a wireless signal; and a transmission unit for transmitting the generated wireless signal and is characterized by transmitting data to a user terminal and receiving the data from the user terminal by assigning the resources to the first and second areas.

CROSS-REFERENCE TO RELATED APPLICATION

This application is a continuation of U.S. patent application Ser. No.13/521,432, filed on Jul. 10, 2012, which is the National Stage Entry ofInternational Application No. PCT/KR2011/000105, filed on Jan. 7, 2011,and claims priority from and the benefit of Korean Patent ApplicationNo. 10-2010-0002495, filed on Jan. 12, 2010, all of which areincorporated herein by reference for all purposes as if fully set forthherein.

BACKGROUND FIELD

The present disclosure relates to a method and apparatus fortransmitting and receiving information associated with an extendedservice region for a predetermined component carrier (CC) from among aplurality of CCs in a wireless communication system.

DISCUSSION OF THE BACKGROUND

Essential technologies associated with data transmission in a wirelesscommunication system have been discussed, and particularly, an effectiveuse of limited radio resources is the one of the main issues.

Therefore, a next generation wireless communication system proposes atechnology that satisfies service requirements through use of theplurality of CCs. For example, to secure a broadband bandwidth tosatisfy the demand for a higher data transmission rate, scattered bandsmay be designed to satisfy basic requirements so that the scatteredbands operate as independent systems, respectively, and carrieraggregation (CA) that binds a plurality of bands into a single systemmay be introduced.

However, detailed technologies have not yet been adopted, and thewireless communication system requires a technology of using a CC tosatisfy service requirements.

SUMMARY

Therefore, the present invention has been made in view of theabove-mentioned problems, and an aspect of the present invention is toprovide a method and apparatus for using flexible frequency resources ina wireless communication system.

Another aspect of the present invention is to provide a method andapparatus for receiving information associated with an extended serviceregion corresponding to a component carrier (CC) in a wirelesscommunication system.

Another aspect of the present invention is to provide a method andapparatus for informing a CC of the use of a contiguous region in awireless communication system.

Another aspect of the present invention is to provide a method andapparatus for transceiving information associated with available regionsin a wireless communication system.

Another aspect of the present invention is to provide a method andapparatus for generating a sequence associated with available regions ina wireless communication system.

Another aspect of the present invention is to provide a method andapparatus for resource allocation that secures quality of service datain a wireless communication system.

Another aspect of the present invention is to provide a method andapparatus for using unused frequency band to improve efficiency in usingresources of a system in the communication system using a plurality ofCCs.

Another aspect of the present invention is to provide a method andapparatus for flexibly setting extensible regions in a wirelesscommunication system by taking into consideration a circumstance inwhich a CC is used, and maximizing efficiency in using wirelessresources.

In accordance with an aspect of the present invention, there is provideda base station (BS), including: a region information generation unit todetermine additional assignment of a second region different from afirst region to a component carrier (CC) of the first region having abandwidth narrower than a maximum assignable bandwidth of a CC, and togenerate information associated with the second region; a mappingcontrol unit to generate a reference signal to be used for channelestimation in the first region and the second region, and to control thereference signal to be assigned to a frequency band including the firstregion and the second region; a signal generation unit to generate theinformation associated with the second region and the reference signalassigned by the mapping control unit to be a wireless signal; and atransmission unit to transmit the generated wireless signal, and the BSallocates resources to the first region and the second region so as toperform transmission and reception of data with a user equipment (UE).

In accordance with another aspect of the present invention, there isprovided a method of transmitting extension information of a CC, themethod including: determining additional assignment of a second regionthat is different from a first region to a CC of the first region havinga bandwidth narrower than a maximum assignable bandwidth of a CC;generating and transmitting information associated with the secondregion; generating a reference signal to be used for channel estimationin the first region and the second region, and transmitting thereference signal by assigning the reference signal to a frequency bandincluding the first region and the second region; and performingtransmission and reception of data with a UE by allocating resources tothe first region and the second region.

In accordance with another aspect of the present invention, there isprovided a UE, including: a reception unit to receive, from a BS througha dedicated signal, information associated with a second regiondifferent from a CC of a first region having a bandwidth narrower than amaximum assignable bandwidth of a CC, and to receive a signal to which areference signal for channel estimation in the first region and thesecond region is assigned; a transmission unit to transmit data to theBS; a storage unit to store received information associated with thesecond region; and a control unit to control the storage unit to storethe information associated with the second region in the storage unit,and to control the transmission unit and the reception unit to performtransmission and reception of data with the BS by receiving allocationof resources in the first region and the second region.

In accordance with another aspect of the present invention, there isprovided a method of receiving extension information of a CC, the methodincluding: receiving, from a BS through a dedicated signal, informationassociated with a second region different from a CC of a first regionhaving a bandwidth narrower than a maximum assignable bandwidth of a CC;receiving a signal to which a reference signal for channel estimation inthe first region and the second region is assigned; and performingtransmission and reception of data with the BS by receiving allocationof resources in the first region and the second region.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a diagram illustrating a plurality of component carriers (CCs)according to an embodiment of the present invention;

FIG. 2 is a diagram illustrating a concept of a bandwidth that an LTEsystem or an LTE-A system is able to use according to an embodiment ofthe present invention.

FIG. 3 is a diagram illustrating an example that extends a frequencyband to an unused region that is different from an assigned regionaccording to an embodiment of the present invention;

FIG. 4 is a diagram illustrating a process that transmits informationassociated with an extensible region to an LTE-A user equipment (UE)according to an embodiment of the present invention;

FIG. 5 is a diagram illustrating an example that transmits informationassociated with an extensible region according to another embodiment ofthe present invention;

FIG. 6 is a diagram illustrating an example that transmits informationassociated with an extensible region through use of an extra carrierindicator (CI) according to another embodiment of the present invention;

FIG. 7 is a diagram illustrating an example that generates a referencesignal unitarily in a subframe according to an embodiment of the presentinvention;

FIG. 8 is a diagram illustrating an example that generates referencesignals separately in a subframe according to an embodiment of thepresent invention;

FIG. 9 is a diagram illustrating a structure of an apparatus thatgenerates and transmits information associated with an extensible regionand a reference signal according to an embodiment of the presentinvention;

FIG. 10 is a diagram illustrating a process in which a base station suchas an e-NodeB (eNB) processes a signal according to an embodiment of thepresent invention;

FIG. 11 is a diagram illustrating a process in which a UE receivesinformation associated with an extensible region and a reference signal,and performs transmission and reception of data in the extensible regionaccording to an embodiment of the present invention; and

FIG. 12 is a diagram illustrating an architecture in which a UE receivesinformation associated with an extensible region and a reference signal,and performs transmission and reception of data in the extensible regionaccording to an embodiment of the present invention.

DETAILED DESCRIPTION OF THE ILLUSTRATED EMBODIMENTS

Hereinafter, exemplary embodiments of the present invention will bedescribed with reference to the accompanying drawings. In the followingdescription, the same elements will be designated by the same referencenumerals although they are shown in different drawings. Further, in thefollowing description of the present invention, a detailed descriptionof known functions and configurations incorporated herein will beomitted when it may make the subject matter of the present inventionrather unclear.

Also, embodiments of the present invention will be described based on awireless communication network, and operations in the wirelesscommunication network may be performed in a process in which a systemthat manages the wireless communication network, for example, a e-NodeB(eNB), controls the network and transmits data, or may be performed in auser equipment (UE) that is connected to the corresponding wirelessnetwork. In the embodiments of the present invention, when a nextgeneration wireless communication system sets a predetermined maximumavailable region, and a portion of the set region is used based on anetwork state, as opposed to using the entire set region, a method toutilize an adjacent frequency domain will be provided.

For example, when only a 15 Megahertz (MHz) band is used among a maximumfrequency band of 20 MHz that is determined for a single CC, a method toutilize a remaining band of 5 MHz may be provided. A method to utilize afrequency band adjacent to the maximum frequency band of 20 MHzdetermined for a single CC is additionally provided. Accordingly, amethod to improve efficiency of a system by satisfying servicerequirements in the wireless communication system will be provided.

That is, in a wireless communication environment for which a method touse a plurality of CCs is proposed, although a plurality of CCs areused, an unused region in a range determined for each CC may exist, andthe unused region may be applicable to only a device in a predeterminedcircumstance or only a device that uses a predetermined protocol. Inthis example, a detailed method to use the unused region will bedescribed.

The wireless communication system may be widely installed so as toprovide various communication services, such as a voice service, packetdata, and the like. The wireless communication system may include a UEand an evolved Node-B (eNB). The UE and the UE may use various resourceallocation methods to be described herein.

Throughout the specifications, the UE may be an inclusive conceptindicating a user terminal utilized in a wireless communication,including a UE in WCDMA, long term evolution (LTE), HSPA, and the like,and a mobile station (MS), a user terminal (UT), a subscriber station(SS), a wireless device, and the like in GSM.

The eNB or a cell may refer to a fixed station where communication withthe UE is performed, and may also be referred to as a Node-B, a basetransceiver system (BTS), an access point, and the like.

The eNB or the cell may be construed as an inclusive concept indicatinga portion of an area covered by a base station controller (BSC) in CDMA,a Node B in WCDMA, and the concept may include various coverage areas,such as a megacell, macrocell, a microcell, a picocell, a femtocell, andthe like.

In the specifications, the UE and the eNB are used as two inclusivetransceiving subjects to embody the technology and technical conceptsdescribed in the specifications, and may not be limited to apredetermined term or word.

A multiple access scheme applied to the wireless communication systemmay not be limited. The wireless communication system may utilize variedmultiple access schemes, such as Code Division Multiple Access (CDMA),Time Division Multiple Access (TDMA), Frequency Division Multiple Access(FDMA), Orthogonal Frequency Division Multiple Access (OFDMA),OFDM-FDMA, OFDM-TDMA, OFDM-CDMA, and the like.

Uplink (UL) transmission and downlink (DL) transmission may be performedbased on a time division duplex (TDD) scheme that performs transmissionbased on different times, or based on a frequency division duplex (FDD)scheme that performs transmission based on different frequencies.

An embodiment of the present invention may be applicable to resourceallocation in an asynchronous wireless communication scheme that isadvanced through GSM, WCDMA, and HSPA, to be LTE and LTE-advanced(LTE-A), and may be applicable to resource allocation in a synchronouswireless communication scheme that is advanced through CDMA andCDMA-2000, to be UMB.

Embodiments of the present invention may not be limited to a specificwireless communication scheme, and may be applicable to all technicalfields to which a technical idea of the present invention is applicable.

FIG. 1 illustrates a plurality of CCs according to an embodiment of thepresent invention.

Referring to FIG. 1, an LTE-A system may support carrier aggregation(CA) that uses up to five CCs to satisfy various service requirements ofa next generation wireless communication system.

That is, the LTE-A may use up to five CCs, and may include at least onebackward-compatible (BC) carrier by taking into considerationcompatibility with an LTE system.

CCs of a DL 110 and CCs of UL 120 may exist independently, and CC0 amongthe CCs may be an example of a BC carrier and each CC may use up to a 20MHz bandwidth. The BC carrier may not be limited to a location of CC0,and CC1, CC2, CC3, or CC4 may be used as a BC carrier based on theconfiguration of a network.

In the wireless communication system, a BC carrier having apredetermined frequency band may be assigned so as to provide a serviceto existing UEs. Hereinafter, embodiments of the present invention willbe described based on the LTE system and the LTE-A system. However, theembodiments of the present invention may not be limited thereto, and maybe applicable to a communication system that uses a partial region of anavailable frequency band and assigns the corresponding region to a UE,by inclusively changing the configuration.

FIG. 2 illustrates a concept of a bandwidth that an LTE system or anLTE-A system is able to use according to an embodiment of the presentinvention.

210 of FIG. 2 may be a configuration of a single CC, and may be aconfiguration of a BC carrier in the LTE system or the LTE-A system. Aregion that may be assigned to a single CC may be up to 20 MHz.

215 may correspond to a region to which control information is assigned,and may be a physical downlink control channel (PDCCH) or a controlregion according to an embodiment of the present invention. 214 maycorrespond to a region through which data is transmitted, and may be aphysical downlink shared channel (PDSCH) according to an embodiment ofthe present invention.

Although the maximum available system bandwidth is set to 20 MHz in 210,generally a region narrower than the full frequency band of 20 MHz maybe used in a process of embodying a BC carrier of the LTE system or theLTE-A system taking compatibility into consideration. The maximum systembandwidth may be increased or decreased based on a condition forembodying the system, and a BC carrier may be embodied within themaximum system bandwidth.

For example, when an actually used bandwidth is set to 10 MHz, aremaining bandwidth of 10 MHz among the maximum bandwidth of 20 MHz maynot be used.

That is, regions 215 and 214 that are narrower than 20 MHz may be used,and unused regions 211 and 212 may exist in the LTE system or the LTE-Asystem using a BC carrier by taking compatibility into consideration, asshown in 210 of FIG. 2.

Therefore, when a BC carrier that provides a service to an existing LTEUE uses a bandwidth less than or equal to 20 MHz as shown in 210, thereis a desire for a scheme to extend a frequency band for the LTE-Asystem.

Accordingly, the LTE-A system may extend the unused region in the LTEsystem or the BC carrier as shown in 220 of FIG. 2. A region that isincluded in the maximum system bandwidth, but is not used by the LTEsystem or the BC carrier may be referred to as a carrier segment. EachCC may extend a frequency band to the region and may be set to use afrequency band up to 20 MHz.

Hereinafter, since a partial region of the maximum system bandwidth isused, a method to utilize the bandwidth by extending a frequency band toa remaining region will be described. In the embodiment, thecorresponding region may be referred to as a segment. However,embodiments of the present invention may not be limited to the segmentor the region, and may include all resources to extend and use systemresources of a currently unused region among the available systembandwidth. 220 of FIG. 2 illustrates a structure of a CC that iscombined with a carrier segment according to an embodiment of thepresent invention. 220 of FIG. 2 may use regions 225 and 224 narrowerthan 20 MHz in the LTE-A system that uses a BC carrier by takingcompatibility into consideration, and may set remaining regions, forexample, carrier segments 221 and 222, as service regions and thus, mayalso improve efficiency of a network in the LTE-A system.

Therefore, the LTE-A system may provide regions 221 and 222 as segmentsso as to additionally assign a bandwidth to a common service band thatprovides an existing LTE service. This may enable the existing LTEservice and the LTE-A-based service to be simultaneously provided, andmay improve efficiency of a network.

A condition for embodying the segment as shown in 220 of FIG. 2 will bedescribed.

An LTE service band (or a BC carrier band) is set to be less than orequal to 20 MHz in a maximum size for a CC, for example, 20 MHz, andthus, an extra frequency band may exist and the extra frequency band maybe embodied as a segment. Also, as inferred from the structure of 220,up to two segments corresponding to two regions or one segmentcorresponding to at least one frequency domain may exist adjacent to theexisting frequency band (the BC frequency band).

A segment may not be used as a separate CC, may correspond to anextension of an existing bandwidth of a CC and thus, may be configuredto be a contiguous frequency domain extension.

Also, embodiments of the present invention may additionally extend afrequency domain to a contiguous region (segment) of a predetermined CIby applying the CI associated with a predetermined CC. In this example,the predetermined CI may be used by receiving assignment of adiscontinuous frequency domain as an additional segment, as opposed tothe contiguous frequency domain. This may also be applicable toembodiments of the present invention. That is, embodiments of thepresent invention may provide a method to separately use an unusedfrequency band existing between a maximum available frequency band of aCC and an actually assigned frequency band.

FIG. 3 illustrates an example that extends a frequency band to an unusedregion that is different from an assigned region according to anembodiment of the present invention. The extended region may be referredto as a segment according to an embodiment of the present invention.

Although two regions, that is, segment 1 211 and segment 2 222 exist in220 of FIG. 2, a single segment may exist based on a network state andan implementation scheme, as shown in 310 and 320 of FIG. 3.

Segment regions 211, 222, 311, and 322 corresponding to regions that areused by extension as shown in 220 of FIG. 2 and FIG. 3 may be irrelevantto an LTE UE. Accordingly, an existing LTE UE may not be aware of theexistence of a segment, and only an LTE-A UE is able to use a segmentregion.

Also, according to an embodiment of the present invention, the segmentregion may be an extension format of a frequency band and thus, maysupport resource allocation of an existing LTE frequency domain (BCcarrier region) and the segment region, through use of single piece ofcontrol information, for example, a PDCCH.

The segments regions 221, 222, 311, and 322 corresponding to extensionsas shown in 220 of FIG. 2 and FIG. 3 may not operate a separate PDCCH tobe used for allocating a segment resource, and may use controlinformation 225, 315, and 325 of the existing LTE frequency domain (a BCcarrier region).

Also, a hybrid ARQ (HARD) process may be applied to a segment and theLTE frequency domain (the BC carrier region), as opposed to separatelyoperating for the segment.

When a segment and a condition for embodying the segment are taken intoconsideration, existing LTE users may need to take into considerationboth a UE of the existing system (LTE) and a UE of the LTE-A, so as toassign a segment in a transmitted and received CC.

Also, a BC carrier corresponding to the LTE service band is continuouslymaintained and a segment corresponding to an extension region may beassigned to be used in the LTE-A UE. A segment may vary based on anetwork state or during a process of operating the network, and abandwidth may be increased or decreased.

Accordingly, an eNB may combine an existing assigned region and anextensible region for the LTE-A UE. For example, resources may beallocated by combining a BC carrier band and a segment band, and anexisting LTE UE may allocate resources with respect to a BC carrier. Aregion (a frequency bandwidth) for resource allocation may vary andthus, although a DL control information (DCI) format transmitted througha PDCCH is the same, a substantially available region may be differentlyconstrued and configured based on whether the LTE-A UE or the LTE UEreceives the DCI format.

According to an embodiment of the present invention, a CI of 3 bits maybe additionally assigned to a DCI format for the LTE-A UE and thus, aportion or all of the information associated with a segment may betransmitted. Hereinafter, additional assignment of the CI of 3 bits willbe described with reference to FIG. 6.

Also, embodiments of the present invention may provide a method totransmit associated system information and a reference signal (RS), soas to enable the LTE-A UE to check the segment information of a CC.

The information associated with the segment of the CC may be configuredto enable the LTE-A UE to recognize whether a segment exists in thecorresponding CC, a number of segments used in a configuration and asegment configuration (three configurations as shown in 220 of FIG. 2and FIG. 3), a bandwidth used by a corresponding segment, and the like.

Also, the information associated with the bandwidth may includeinformation associated with a maximum bandwidth of the correspondingsegment, and may include information associated with a maximum bandwidthof the corresponding segment and a BC carrier.

When the maximum bandwidth of the CC is 20 MHz as shown in 220 of FIG. 2and FIG. 3, a sum of a band of the segment and an already assigned bandof the CC may not exceed 20 MHz. Also, when a minimum frequency domainof the BC carrier is set in advance, information associated with thebandwidth of the segment may be configured based on the maximumbandwidth of the CC and the minimum frequency size of the BC carrier.

The information associated with the carrier segment may be needed forthe LTE-A UE, and may be information that is not needed to betransferred to the LTE-UE.

However, an LTE UE may exist in the BC carrier region where the CCsegment exists and thus, an additional information providing method mayneed to be considered so that the LTE-A UE may recognize the BC carrierregion.

The CC segment may perform channel estimation and thus, may needallocation of an RS, which will be described with reference to FIGS. 7and 8.

FIG. 4 illustrates a process that transmits information associated withan extensible region to an LTE-A UE according to an embodiment of thepresent invention. An extension region may be referred to as a segmentaccording to an embodiment of the present invention.

Referring to FIG. 4, an eNB 410 may transmit segment information throughuse of, for example, a dedicated signal.

The eNB 410 may allocate resources to a bandwidth including CC segmentsof LTE-A UEs 421, 424, and 425, and may transmit segment informationassociated with a corresponding segment to all the LTE-A UEs 421, 424,and 425 included in a cell, simultaneously or individually, through useof a UE dedicated signal or an LTE-A UE dedicated signal.

In this example, the segment information may be information associatedwith a frequency bandwidth of an extensible region or informationassociated with a location of a start frequency. When a UE and an eNBagree on, in advance, an extension up to a maximum extensible region (amaximum bandwidth of a CC), the frequency band may be extended by apredetermined size based on the information associated with the locationof the start frequency or a currently assigned frequency band.

In this example, LTE UEs 422 and 423 may not receive the segmentinformation and may operate in the same manner as in an existing LTEsystem.

FIG. 5 illustrates an example that transmits information associated withan extensible region according to another embodiment of the presentinvention. In the embodiment, an extension region may be referred to asa segment.

FIG. 5 illustrates a method in which a dedicated signal as described inFIG. 4 may be used and existence of a segment corresponding to theextensible region may be determined based on common control information.An eNB may reconfigure or use control information that is not used by anLTE UE as an indicator, so as to inform an LTE-A UE of information thatthe segment is contiguous to a BC carrier.

According to an embodiment of the present invention, the extensibleregion may be indicated through use of a DCI format of a PDCCH in FIG.5. That is, when a segment exists in a corresponding CC, a CI may beincluded in the DCI format. That is, the LTE-A UE may recognize that thesegment is contiguous to the BC carrier when the CI is included in thePDCCH and thus, may request segment information from the eNB and mayreceive the segment information from the eNB through use of thededicated signal of FIG. 4.

FIG. 5 illustrates two types of PDCCHs 510 and 520. The PDCCH 510 ofwhich a DCI format includes a CI may indicate that segment 1 540 orsegment 2 560 exists to be contiguous to a BC carrier 550. Accordingly,the LTE-A UE may only determine the existence of the segment, and maydetermine a segment configuration and a bandwidth used by the segmentthrough use of the dedicated signal of FIG. 4. That is, when the CI isincluded in the PDCCH 520, the LTE-A UE may request segment informationfrom the eNB or may receive the segment information from the eNB,through dedicated signaling.

Conversely, the PDCCH 520 of which a DCI format fails to include a CImay indicate that a segment does not exist and thus, the LTE-A UE mayuse only the BC carrier 550, like the LTE UE. According to an embodimentof the preset invention, the eNB may inform the LTE-A UE of whether asegment exists, through use of information associated with a CI of a DCIformat, and the eNB may inform the LTE-A UE of detailed informationassociated with the segment through use of a type of a dedicated signaland the like as illustrated in FIG. 4.

FIG. 6 illustrates an example that transmits information associated withan extensible region through use of an extra CI according to anotherembodiment of the present invention. In the embodiment, an extensionregion may be referred to as a segment.

Referring to FIG. 6, segment configurations 651, 652, and 653 areillustrated.

A PDSCH may be a frequency band that an existing LTE UE is also able touse, and may be a BC carrier band. The full frequency band of the PDSCHincluding segment 1 and segment 2 may be an available system bandwidthof up to 20 MHz.

As described in the foregoing, an LTE-A system may use a plurality ofCCs. Also, the LTE-A system may use the plurality of CCs based on a CAscheme, and may additionally add a CI to a field that is separate from aDCI format of a PDCCH so as to use the field to distinguish CCs duringthe CA process.

According to an embodiment of the present invention, to indicate anextensible segment region, information or a codepoint that is not usedin a control channel may be used so that a value that is not used in afield used in the control channel indicates a segment, separately.Although a range of a predetermined value of a CI may be used as acodepoint, it may not be limited to the CI and various field values maybe used to indicate a segment.

Although a total number of CCs provided by the LTE-A system according toan embodiment may be 5, the number of CCs may be increased or decreasedduring a process of embodying the system. When all of the current CC of3 bits is not used and regions corresponding to a few values are used, asegment may be indicated as shown in Table 1.

Hereinafter, when up to 5 CCs are used an embodiment that uses a CIvalue will be described. When a maximum number of CCs increases, a CIconfiguration may be changed, and embodiments of the present inventionmay be differently applied based on the change of the CI configuration.When the number of CCs is up to 5, a total of 3 bits of a CI assigned toidentify a CC during a CA process may be expended. A number of casesthat may be expressed by the 3 bits may be 8. When an eNB and a UE agreeto use only five pieces of information, the remaining three cases may beused as an extra CI. FIG. 6 and Table 1 show the cases that use theextra CI.

TABLE 1 first example that uses an extra CI CC identification 3-bit CIinformation Segment configuration 000 CC1 N/A 001 CC2 N/A 010 CC3 N/A011 CC4 N/A 100 CC5 N/A 101 N/A 653 of FIG. 6 110 N/A 652 of FIG. 6 111N/A 651 of FIG. 6

As shown in Table 1, information that is not used from among the CIvalues of 3 bits to be used for identifying a CC during the CA processmay be used as an identifier to indicate whether a segment exists. Whena small number of CCs is used in the CA process and a range of numbersthat is used as a CI value may decrease, a codepoint may be used todistinguish the CI value and when the CI value is greater than or equalto a predetermined value, the eNB and the UE agree that the CI value maybe used to indicate a segment value.

For example, the CI value used for distinguishing a CC may be set to 000for CC1, may be set to 001 for CC2, may be set to 010 for CC3, may beset to 011 for CC4, and may be set to 100 for CC5.

To configure segment information corresponding to an extensible region,101, 110, 111 may be set as CI values. The CI values of 101, 110, and111 may be information that is not used for identifying a CC and thus,may be used as information for an extended segment.

When the CI value is 101, segment 1 may be assigned to be contiguous toa BC carrier, as shown in 653 of FIG. 6. When the CI value is 110,segment 2 may be assigned to be contiguous to the BC carrier, as shownin 652 of FIG. 6. When the CI value is 111, both segment 1 and segment 2may be assigned to be contiguous to the BC carrier, as shown in 651 ofFIG. 6.

The CI value and the segment configuration of Table 1 may be variouslydetermined based on a predetermined agreement in a process of embodyingthe invention.

As described in FIG. 6 and Table 1, information associated with theextensible region may be provided through use of an unused parameter.For example, three values from among the CI information may indicatewhether a segment exists and the segment configuration format, as shownin Table 1. Information associated with the segment configuration formatmay indicate a number of segments and a set segment configuration, forexample, use of a right segment, a left segment, or both segments of acorresponding CC and thus, an LTE-A UE may determine an extended serviceregion.

Accordingly, when a PDCCH includes CI information and a CI value mayinclude the segment configuration, the LTE-A UE may request or receiveinformation associated with the extensible region from the eNB. Asdescribed in the foregoing, the LTE-A UE may request or receiveinformation associated with a bandwidth of a segment from the eNBthrough a dedicated signaling scheme.

In the example, when a total number of used CCs is 3, a codepoint may beapplied. A CI value that is in a range of 0 through 2 may be used asinformation to identify a CC, and a CI value that is greater than orequal to 3 may be used as information indicating a segment correspondingto an extensible region. Also, when a CI uses 4 bits or 5 bits and anumber of indicated CCs does not use all the information of the 4 bitsor 5 bits, the remaining portion may be embodied to indicate a segmentregion. The CI information is merely an example to indicate segmentconfiguration information in a PDCCH and thus, another field may beused, or a value of another field or a value of another size may bereused through use of a codepoint.

Also, the LTE-A UE may receive the segment information through use of anupper layer signaling. When the LTE-A UEs are assigned with the samesegment, the segment information may be received through a commonchannel. In this example, the segment information may be receivedthrough system information (SI) or a broadcast channel (BCH).

A method of transmitting information associated with a segment to theLTE-A UE has been described with reference to FIGS. 4, 5, and 6according to embodiments of the present invention.

The segment information transmitting method embodied in FIGS. 4, 5, and6 may not require a change of a separate system of an LTE UE thatcoexists within the BC carrier. Accordingly, the LTE-UE may notrecognize a carrier segment, and system information limited to the BCcarrier, such as a master information block (MIB) and a systeminformation block (SIB), may be broadcasted through a PDCCH or a controlregion. The transmitted system information may include a cell identifier(ID), a DL center frequency, a DL bandwidth, a system frame number, andthe like, excluding information associated with the carrier segment.

The information associated with an extend segment region may betransmitted so that the LTE-A UE determines the information as shown inFIGS. 4, 5, and 6. Accordingly, the LTE UE may not need to be changed,and a compatibility of the BC carrier may be maintained.

When both a BC carrier and a frequency band of an available network aretaken into consideration, the carrier segment may be selectively usedand thus, the method that is resilient to a network state as shown inFIGS. 4, 5, and 6 will satisfy both the compatibility and efficiency ofthe network.

According to an embodiment of the present invention, a segment may bedynamically assigned and a size of the segment may be increased ordecreased based on efficiency of the network. The detailed informationmay be transmitted to the LTE-A UE through dedicated signaling asdescribed in the foregoing, and the LTE UE that uses only the BC carrierband may perform communication irrespectively of an extension of a CC ofthe LTE-A UE, for example, generation, change, removal, and the like ofa segment.

Hereinafter, channel estimation in a carrier segment will be describedaccording to an embodiment of the present invention. Channel estimationmay also need to be performed with respect to the carrier segment thatis extended and used.

Accordingly, a method of using an RS for channel estimation associatedwith an extended segment, such as a cell-specific reference signal (CRS)and a channel state information-reference signal (CRI-RS), will bedescribed.

In this example, a compatibility with the LTE UE needs to be taken intoconsideration and thus, the method may not affect an RS generation andmapping in the existing LTE band. Accordingly, the RS may be generatedto be mapped based on a cell ID and a system bandwidth.

Also, a method of generating and mapping the RS may include 1)maintaining a mapping scheme of a CRS in a BC carrier, 2) applying an RSgeneration used in the existing LTE system, and 3) using an RSgeneration procedure of the existing LTE system for an RS assigned for acarrier segment. Based on this, an RS with respect to a segment may begenerated as shown in FIGS. 7 and 8.

FIG. 7 illustrates an example that generates an RS unitarily in asubframe according to an embodiment of the present invention. Anextension region may be referred to as a segment according to anembodiment of the present invention.

Referring to FIG. 7, a cell ID and a DL system bandwidth may be usedwhen an RS is generated in an LTE system.

In FIG. 7, a sequence may be generated by inputting the cell ID as aninitial value of a Pseudo-random sequence generator 710 and using allthe bandwidth including a bandwidth of a BC carrier and segments as abandwidth of a system.

In FIG. 7, a sequence 720 having a length of N+M may be generatedthrough use of N calculated from a length of the bandwidth of the BCcarrier and M calculated from a length of the bandwidth of a segmentcorresponding to an extensible region. From among generated sequences, 0through N−1 sequences may be mapped as sequences associated with an RSof a BC carrier 730, and N through M+1 sequences may be mapped assequences of an RS associated with segments 751 and 752.

FIG. 8 illustrates an example that generates RSs separately in asubframe according to an embodiment of the present invention.

Referring to FIG. 8, a BC carrier 830 and segments 851 and 852 maygenerate RSs separately and may perform mapping and thus, the BC carrier830 may proceed with a RS generating process in an existing LTE system.

A pseudo-random sequence generator 811 may set a cell ID to an initialvalue, and may generate a sequence 821 through use of N calculated froma bandwidth of the BC carrier 830 as a length of the sequence. Thesequence 821 may be mapped to the BC carrier 830.

Another pseudo-random sequence generator 812 may generate a sequencewith respect to a segment, irrespectively of the pseudo-random sequencegenerator 811. That is, pseudo-random sequence generator 812 may not usethe cell ID corresponding to the sequence generation initial value ofthe pseudo-random sequence generator 811, and may set an initial value Mby adding a predetermined offset to the cell ID. That is, a sequence 822having a length corresponding to the segment band may be separatelygenerated and mapped.

An RS that is not applicable to an LTE UE and is needed for only theLTE-A UE, such as a CSI-RS, may be generated and assigned based on botha BC carrier and a segment.

When an RS is generated as described in FIGS. 7 and 8, an RS may existin an existing LTE band and may simultaneously exist in a carriersegment corresponding to a frequency band extended to be contiguous tothe existing LTE band. The RS may be generated based on the existing LTEband and thus, an LTE-UE may not need to be changed and compatibilitymay be satisfied.

FIG. 9 illustrates an architecture that generates and transmitsinformation associated with an extensible region in an eNB and an RSaccording to an embodiment of the present invention. The extensionregion may be referred to as a segment according to an embodiment of thepresent invention. Component elements that may be included in the eNBmay include a segment information generation unit, a mapping controlunit, a signal generation unit, and a transmission unit.

In particular, the segment information generation unit may determine anadditional assignment of a second region (a second segment) that isdifferent from a first region (a first segment) to a CC of the firstregion (the first segment) having a bandwidth narrower than a maximumassignable bandwidth of a CC, and may generate information associatedwith the second region (the second segment).

The mapping control unit may generate an RS to be used for channelestimation in the first region (first segment) and the second region(the second segment), and may perform controlling so as to assign the RSto a frequency band including the first region (the first segment) andthe second region (the second segment).

The signal generation unit may generate the information associated withthe second region (the second segment) and the RS signal assigned by themapping control unit to be a wireless signal, and the transmission unitmay transmit the generated wireless signal. Subsequently, resources maybe allocated to the first and second regions (the first and secondsegments) including the extended region, so that transmission andreception of data with a UE may be performed.

FIG. 9 will be described based on a segment according to an embodimentof the present invention. Segment information may be divided intosegment configuration information and segment detailed information. Thesegment configuration information may include whether a segment existsand information associated with a segment configuration format. Also,the segment detailed information may include a bandwidth of a segment,system information, and the like.

The segment configuration information and the segment detailedinformation may be transmitted through dedicated signaling as describedin FIG. 4. Also, the segment configuration information may betransmitted through an unused value of a CI and the segment detailedinformation may be transmitted through a dedicated signal, as shown inFIG. 6 and Table 1. Only the information associated with the existenceof a segment from among the segment configuration information may bedetermined through a CI field as shown in FIG. 5, and the remainingsegment configuration information and the segment detailed informationmay be embodied to be transmitted through a dedicated signal. Althoughembodiments of the present invention describe a dedicated signal as anexample, and the segment detailed information and the segmentconfiguration information may be transmitted and received through an RRCsignaling or a separate upper signaling.

Referring to FIG. 9, a segment information transmitting apparatus mayshow a configuration of an eNB.

Accordingly, the transmitting apparatus may include a segmentinformation generation unit 901 to generate segment informationassociated with an extensible region in a CC, a mapping control unit 997to generate an RS for channel estimation and to perform controlling soas to assign the RS to the segment and the CC, a signal generation unit990 to generate the segment information and the RS assigned by themapping control unit to be a wireless signal, and a transmission unit995 to transmit the generated wireless signal.

The eNB may perform transmission and reception of data with a UE,through use of resources of the CC and the segment contiguous to the CC.

As described in the foregoing, segment configuration informationcorresponding to one of the segment information generated by the segmentinformation generation unit 901 may be included in a region of a PDCCHcorresponding to a control region, as predetermined indicationinformation, as shown in FIGS. 5 and 6.

In particular, when the segment is contiguous to the CC, a CI may beincluded in a DCI format of the PDCCH as shown in FIG. 5 and thus, anLTE-A UE may determine whether a segment is assigned through use of theCI of the DCI format of the PDCCH. That is, when the CI is included inthe DCI format of the PDCCH, a UE may determine that informationassociated with the second region that is extensible is included.

When the segment exists, information associated with a segmentconfiguration format or a bandwidth of a segment may be requested fromthe eNB, and the eNB may transmit or receive detailed informationthrough the dedicated signaling of FIG. 4, irrespectively of therequest.

In the same manner, an extra CI corresponding to an extended CI of theDCI format of the PDCCH may be configured to include the segmentconfiguration information. The CI may be configured to includeinformation associated with a number of segments and a segment structurein remaining information excluding information used for identifying aCC, as shown in Table 1.

The segment information transmitted by the eNB may be generated to be awireless signal. This process may be performed in the signal generationunit 990, which will be described as follows. A codeword generating unit905 may generate the segment information to be a codeword, and thecodeword may be scrambled in scrambling units 910 through 919. Blocks ofthe scrambled bits may be modulated to be a symbol based on apredetermined modulation scheme in modulation mappers 920 through 929.The modulation may include biphase shift keying (BPSK), quadrature phaseshift keying (QPSK), and the like. In a case of a PDCCH, modulation maybe performed through the QPSK.

The symbol may be mapped to various layers by a layer mapper 930. Inthis process, when a single antenna port is used for transmission, thesymbol may be mapped to a single layer for transmission.

Conversely, when a plurality of antenna ports is used for transmission,a multi-antenna transmission scheme may be used. The layer mapping maybe performed through use of the multi-antenna transmission scheme suchas a spatial multiplexing or a transmit diversity.

When the layer mapping is completed, a precoding unit 940 may generate avector block so that mapping is performed on resources based on amapping scheme of an antenna port. A precoding scheme may be determinedbased on a number of antennas determined by the layer mapping and amulti-antenna mapping scheme.

When the precoding is completed, resource element (RE) mappers 950through 959 may perform mapping with respect to REs.

A mapping control unit 997 to control mapping with respect to the RSsmay control the RE mappers 950 through 959 so that an RS with respect toa segment may be transmitted together.

In particular, as shown in FIG. 7, the mapping control unit 997 mayperform controlling so as to assign an RS based on a single sequencethat is generated by a single sequence generator through use of a lengthof a CC and the entire segment and a cell ID of the CC. In this example,the RS may be assigned to the CC and the entire segment.

Conversely, as shown in FIG. 8, the mapping control unit 997 maygenerate separate sequences through use of two sequence generators 903and 904.

The first sequence generator 903 may generate a first sequence through avalue calculated from a bandwidth of the CC and the cell ID of the CC,and the second sequence generator 904 may generate a second sequencethrough a value calculated from a bandwidth of the segment and a valueobtained by adding a predetermined offset to the cell ID of the CC.

The mapping control unit 997 may control the RE mapper so as to assignthe RS to the CC based on the first sequence, and may control the REmapper so as to assign the RS to the segment based on the secondsequence.

When the RE mapping is completed, OFDMs generated by OFDM signalgenerating units 960 through 969 may be transmitted through an antennaport of the transmission unit 975.

The various component elements of the signal generation unit 990 mayfunction as a single module, or may function as separate sub-modules.Also, a predetermined module may be excluded based on a characteristicof a communication protocol, or a separate module required for thecommunication protocol may be added.

Also, a receiving apparatus according to embodiments of the presentinvention may reversely perform the operation of the transmittingapparatus. For example, a segment information acquirement unit of thereceiving apparatus is a block that corresponds to the segmentinformation generation unit 901 of the transmitting apparatus, and mayreceive segment information through a dedicated signaling, or mayreceive segment detailed information through the dedicated signal afterdetermining existence of a segment by receiving an unused value of anextra CI, as shown in FIG. 6 and Table 1, or may determine the existenceof the segment through a CI field as shown in FIG. 5 and may receiveboth the remaining segment configuration information and the segmentdetailed information through the dedicated signaling.

That is, the segment information acquirement unit may determineinformation received through the dedicated signaling, may determinepredetermined indication information in a region of a PDCCH, ordetermine whether a segment is assigned through use of a CI of a DCIformat of the PDCCH. In this example, the receiving apparatus mayinclude a mapping control unit 997 so as to perform channel estimationwith respect to an additionally assigned segment region. In thisexample, a sequence for channel estimation may be configured based ondescriptions provided with reference to FIGS. 7 and 8. In particular, itwill be described with reference to FIG. 12.

FIG. 10 illustrates a process of transmitting information associatedwith an extensible region according to an embodiment of the presentinvention. The extension region may be referred to as a segmentaccording to an embodiment of the present invention.

Referring to FIG. 10, an eNB may generate segment information associatedwith a segment contiguous to a CC, and may transmit the segmentinformation to a UE through use of a dedicated signal (step S1010). Thesegment information may be divided into segment configurationinformation and segment detailed information. As described in theforegoing, the process of transmitting the segment information is thesame as FIG. 4.

The segment configuration information of the segment information may beconfigured to be included in a control region or control information ofthe CC as an indicator, as shown in FIGS. 5 and 6.

In particular, when the segment is contiguous to the CC, a CI may beconfigured to be included in a DCI format of a PDCCH. When the CI isincluded in the DCI format of the PDCCH, an LTE-A UE may determine thata segment exists and thus, the LTE-A UE may receive remaining segmentconfiguration information and the segment detailed information through adedicated signal.

However, as shown in FIG. 6, the segment configuration information maybe included as an extra carrier format in the CI of the DCI format ofthe PDCCH. In this example, the segment configuration information may beconfigured to include information associated with a number of segmentsand a segment structure as shown in Table 1.

Also, when the extra CI value is set in the DCI format of the PDCCH, theLTE-A UE may determine the segment configuration information and thus,may receive the segment detailed information through a dedicated signal.

In addition to the transmission of the segment information, an RS may begenerated and may be assigned to the segment and the CC for transmission(step S1020). This may be performed irrespectively of step S1010, or maybe performed simultaneously with step S1010. As described in FIGS. 7 and8, the RS may be generated by taking into consideration compatibilitywith an LTE UE.

As described in FIG. 7, a sequence may be generated based on a length ofthe entire segment and the CC and a cell ID of the CC, and an RS may beassigned based on the sequence.

Also, as described in FIG. 8, a first sequence may be generated based ona value calculated from a bandwidth of the CC and the cell ID of the CC,and an RS may be assigned to the CC based on the first sequence.

Also, a second sequence may be generated based on the value calculatedfrom a bandwidth of the sequence and a value obtained by adding apredetermined offset to the cell ID of the CC, and the RS may beassigned to the segment based on the second sequence.

After transmission of the segment information and the RS, transmissionand reception of data with the UE may be performed by allocatingresources to the CC and the segment that is contiguous to the CC.

The process of transmitting the segment information through a dedicatedsignaling may be performed by combining generating of an RS andassigning and transmitting of the RS, or by proceeding with one of themfirst. Although FIG. 10 has been described by using an extensible regionas a segment, this may not be limited thereto, and the extensible regionmay be applicable to a region that is separately used by a system to beembodied, in addition to the segment.

FIG. 11 illustrates a process in which a UE receives informationassociated with an extensible region and an RS, and performstransmission and reception of data in the extensible region according toan embodiment of the present invention. The extension region may bereferred to as a segment according to an embodiment of the presentinvention.

The UE may receive segment information associated with a segmentcontiguous to a CC, from an eNB through a dedicated signal (step S1110).As described in FIG. 4, the UE may receive all the segment informationthrough the dedicated signal, as described in FIG. 4.

Information associated with whether the segment exists or segmentconfiguration information may be included in a control region or controlinformation of a CC as an indicator, as shown in FIGS. 5 and 6.

In particular, when the segment is contiguous to the CC, whether a CI isincluded in a DCI format of a PDCCH may be determined. In this example,when the CI is included, it indicates that an indicator indicatinginformation associated with the segment is included and thus, the UE mayrequest segment configuration information and segment detailedinformation from the eNB, and may receive the information through thededicated signal in the same manner as step S1110.

Also, the segment configuration information may be included in the CI ofthe DCI format of the PDCCH, and information associated with a number ofsegments and segment structure is included in the CI and thus, the UEmay request the segment detailed information from the eNB and mayreceive the information through a dedicated signal in the same manner asstep S1110.

A signal to which an RS for channel estimation is assigned may bereceived irrespective of or simultaneously with step S1110 (step S1120).The RS for channel estimation may be generated based on two schemes asdescribed in FIGS. 7 and 8, and may be transmitted.

FIG. 12 illustrates an architecture in which a UE receives informationassociated with an extensible region and an RS, and performstransmission and reception of data in the extensible region according toan embodiment of the present invention.

Referring to FIG. 12, the architecture may include a control unit 1210,a reception unit 1220, a transmission unit 1230, and a storage unit1240. A segment information acquirement unit that has been describedwith reference to FIG. 9 may be included in the control unit 1210.

In particular, the reception unit 1220 may receive, from an eNB througha dedicated signal, information associated with a second region that isdifferent from a CC of a first region having a bandwidth narrower than amaximum assignable bandwidth of a CC, and may receive a signal to whichan RS for channel estimation in the first region and the second regionis assigned. The transmission unit 1230 may transmit data to the eNB.The storage unit 1240 may store the information associated with thereceived second region, and the control unit 1210 may control thereception unit 1220, the transmission unit 1230, and the storage unit1240.

In particular, the control unit 1210 may control the storage unit 1240so that the information associated with the second region is stored inthe storage unit 1240, and may control the transmission unit 1230 andthe reception unit 1220 to perform transmission and reception of datawith the eNB by receiving allocation of resources in the first regionand the second region. Here, an example of the second region may be asegment.

As described in FIGS. 5 and 6, the information associated with thesecond region may be included in a control region or control informationof the CC of the first region as an indicator, and may be transmitted.In particular, the control information may be received through a PDCCH.When a CI is included in a DCI format of the PDCCH as shown in FIG. 5,the control unit 1210 may perform controlling so that the second regionis assigned to be contiguous to the first region. When the controlinformation is received through the PDCCH, and configuration informationassociated the second region is included in the CI of the DCI format ofthe PDCCH as shown in FIG. 6, the control unit 1210 may performcontrolling based on the information associated with a number of secondregions and a second region structure, included in the CI.

As described in FIG. 7, an RS may be assigned based on a sequence thatis generated based on a length of the entire second region and the CC ofthe first region and a cell ID of the CC of the first region. Asdescribed in FIG. 8, an RS included in a bandwidth of the CC of thefirst region may be mapped based on a first sequence that is generatedbased on the bandwidth of the CC of the first region and a cell ID of acell that includes the CC of the first region, and an RS included in abandwidth of the second region may be mapped based on a second sequencethat is generated based on a value calculated from the bandwidth of thesecond region and a value obtained by adding a predetermined offset tothe cell ID of the CC of the first region.

As described in FIG. 7, an RS may be mapped based on a sequence that isgenerated based on a length of the entire segment and the CC and thecell ID of the CC.

Also, as described in FIG. 8, mapping may be performed by applyingdifferent sequences to the CC and the segment. An RS mapped to the CCmay be checked by an LTE UE.

Accordingly, the segment method may maintain compatibility and improveefficiency in using a network band by additionally assigning a region inaddition to a frequency band that provides a service to existing users.

Although exemplary embodiments of the present invention have beendescribed for illustrative purposes, those skilled in the art willappreciate that various modifications, additions and substitutions arepossible, without departing from the scope and spirit of the inventionas disclosed in the accompanying claims. Therefore, the embodimentsdisclosed in the present invention are intended to illustrate the scopeof the technical idea of the present invention, and the scope of thepresent invention is not limited by the embodiment. The scope of thepresent invention shall be construed on the basis of the accompanyingclaims in such a manner that all of the technical ideas included withinthe scope equivalent to the claims belong to the present invention.

What is claimed is:
 1. A base station (BS), comprising: a regioninformation generator to determine additional assignment of a secondregion in a frequency band different from a first region in thefrequency band, a component carrier (CC) of the first region having abandwidth narrower than a maximum assignable bandwidth of the CC, and togenerate information associated with the second region; a mappingcontroller to generate a reference signal to be used for channelestimation in the first region and the second region, and to control thereference signal to be assigned to a frequency band including the firstregion and the second region; a signal generator to generate a wirelesssignal comprising the information associated with the second region andthe reference signal assigned by the mapping controller; and atransmitter to transmit the generated wireless signal, wherein the BSallocates resources to the first region and the second region so as toperform transmission and reception of data with a user equipment (UE),wherein the information associated with the second region is included ina control region or control information of the CC of the first region asan indicator.
 2. The BS as claimed in claim 1, wherein the controlinformation is transmitted through a physical downlink control channel(PDCCH), and the information associated with the second region isconfiguration information that is included in a carrier indicator (CI)of a downlink control information (DCI) format of the PDCCH; and theconfiguration information associated with a structure and frequencylocation of the second region is included in the CI.
 3. The BS asclaimed in claim 1, wherein the mapping controller performs controllingso that the reference signal is assigned based on a sequence that isgenerated through using a carrier indicator (CI) of the CC of the firstregion and a total length of the first and second region.
 4. The BS asclaimed in claim 3, wherein the total length of the sequence is (N+M),and a length N of the first sequence is determined based on thebandwidth of the CC of the first region, and a length M of the secondsequence is determined based on the bandwidth of the second region.
 5. Amethod for transmitting extension information of a component carrier(CC), the method comprising: determining an additional assignment of asecond region in a frequency band that is different from a first regionin the frequency band, a CC of the first region having a bandwidthnarrower than a maximum assignable bandwidth of the CC; generating andtransmitting information associated with the second region; generating areference signal to be used for channel estimation in the first regionand the second region, and transmitting the reference signal byassigning the reference signal to a frequency band including the firstregion and the second region; and performing transmission and receptionof data with a user equipment (UE) by allocating resources to the firstregion and the second region, wherein the information associated withthe second region is included in a control region or control informationof the CC of the first region as an indicator.
 6. The method as claimedin claim 5, wherein the control information is transmitted through aphysical downlink control channel (PDCCH), and the informationassociated with the second region is configuration information that isincluded in a carrier indicator (CI) of a downlink control information(DCI) format of the PDCCH; and the configuration information associatedwith a structure and frequency location of the second region is includedin the CI.
 7. The method as claimed in claim 5, wherein the referencesignal is assigned based on a sequence that is generated through using acarrier indicator (CI) of the CC of the first region and a total lengthof the first and second region.
 8. The method as claimed in claim 7,wherein the total length of the sequence is (N+M), and a length N of thefirst sequence is determined based on the bandwidth of the CC of thefirst region, and a length M of the second sequence is determined basedon the bandwidth of the second region.
 9. A user equipment (UE),comprising: a receiver to receive, from a base station (BS) through adedicated signal, information associated with a second region in afrequency band different from a first region in the frequency band, acomponent carrier (CC) of the first region having a bandwidth narrowerthan a maximum assignable bandwidth of the CC, and to receive a signalto which a reference signal for channel estimation in the first regionand the second region is assigned; a transmitter to transmit data to theBS; a storage device to store received information associated with thesecond region; and a controller to control the storage device to storethe information associated with the second region, and to control thetransmitter and the receiver to perform transmission and reception ofdata with the BS by receiving allocation of resources in the firstregion and the second region, wherein the information associated withthe second region is included in a control region or control informationof the CC of the first region as an indicator, and is transmitted. 10.The UE as claimed in claim 9, wherein the control information isreceived through a physical downlink control channel (PDCCH), and theinformation associated with the second region is configurationinformation that is included in a carrier indicator (CI) of a downlinkcontrol information (DCI) format of the PDCCH; and the controllerperforms controlling so as to receive an assignment of the second regionthrough use of the configuration information associated with a structureand frequency location of the second region included in the CI.
 11. TheUE as claimed in claim 9, wherein the reference signal is assigned basedon a sequence that is generated using a carrier indicator (CI) of the CCof the first region and a total length of the first and second region.12. The UE as claimed in claim 11, wherein the total length of thesequence is (N+M), and a length N of the first sequence is determinedbased on the bandwidth of the CC of the first region, and a length M ofthe second sequence is determined based on the bandwidth of the secondregion.
 13. A method for receiving extension information of a componentcarrier (CC), the method comprising: receiving, from a base station (BS)through a dedicated signal, information associated with a second regionin a frequency band different from a first region in the frequency band,a CC of the first region having a bandwidth narrower than a maximumassignable bandwidth of the CC; receiving a signal to which a referencesignal for channel estimation in the first region and the second regionis assigned; and performing transmission and reception of data with theBS by receiving allocation of resources in the first region and thesecond region, wherein the information associated with the second regionis included in a control region or control information of the CC of thefirst region as an indicator.
 14. The method as claimed in claim 13,wherein the control information is received through a physical downlinkcontrol channel (PDCCH), and the information associated with the secondregion is configuration information that is included in a carrierindicator (CI) of a downlink control information (DCI) format of thePDCCH; and the method further comprises receiving assignment of thesecond region based on the configuration information associated with astructure and frequency location of the second region included in theCI.
 15. The method as claimed in claim 13, wherein the reference signalis assigned based on a sequence that is generated through using acarrier indicator (CI) of the CC of the first region and a total lengthof the first and second region.
 16. The method as claimed in claim 15,wherein the total length of the sequence is (N+M), and a length N of thefirst sequence is determined based on the bandwidth of the CC of thefirst region, and a length M of the second sequence is determined basedon the bandwidth of the second region.